References

Ed. Evans, A., R. Garrison, and N. Schlager.2003. Grzimeks' animal life encyclopedia.      Thomson-Gale, Detroit, Michigan, USA.

Ed. O’Toole, C. 2002. Firefly encyclopedia of insects and spiders.Firefly, Toronto, Ontario,         Canada.

Ed. Resh, V. and R. Cardé. 2003.  Encyclopedia of insects.  Academic Press, San Diego,  California, USA.
                                                                                                                                    
Johnson, B. 2011.Insect ID.  Horticulture Vol. 108 Issue 5, p12.
 
Swan,L., and Papp, C. 1972. The common insects of North America.Harper & Row. New            York,   New York, USA.

Bumblebee behavior. 1997-2012. <http://www.bumblebee.org/foraging.htm>. Accessed 3 April 2012.

Bumblebee antenna. 1997-2012. <http://www.bumblebee.org/bodyAntenna.htm>. Accessed 3 April 2012.

Bumblebee behavior. 1997-2012. <http://www.bumblebee.org/faqBehaviour.htm>. Accessed 3 April 2012.

 

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